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Changes in Carrying Amount of Goodwill (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Jun. 30, 2014
Goodwill [Roll Forward]    
Beginning Balance $ 168,146us-gaap_Goodwill $ 168,146us-gaap_Goodwill
Ending Balance 168,146us-gaap_Goodwill 168,146us-gaap_Goodwill
MCE    
Goodwill [Roll Forward]    
Beginning Balance 134,378us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= mrcy_MercuryCommercialElectronicsMember		 134,378us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= mrcy_MercuryCommercialElectronicsMember
Ending Balance 134,378us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= mrcy_MercuryCommercialElectronicsMember		 134,378us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= mrcy_MercuryCommercialElectronicsMember
MDS    
Goodwill [Roll Forward]    
Beginning Balance 33,768us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= mrcy_MercuryDefenseSystemsMember		  
Ending Balance $ 33,768us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= mrcy_MercuryDefenseSystemsMember